64855577 has 2 divisors, whose sum is σ = 64855578. Its totient is φ = 64855576.

The previous prime is 64855547. The next prime is 64855579. The reversal of 64855577 is 77555846.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35868121 + 28987456 = 5989^2 + 5384^2 .

It is a cyclic number.

It is not a de Polignac number, because 64855577 - 2¹⁰ = 64854553 is a prime.

Together with 64855579, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64855579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32427788 + 32427789.

It is an arithmetic number, because the mean of its divisors is an integer number (32427789).

Almost surely, 2^64855577 is an apocalyptic number.

It is an amenable number.

64855577 is a deficient number, since it is larger than the sum of its proper divisors (1).

64855577 is an equidigital number, since it uses as much as digits as its factorization.

64855577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176000, while the sum is 47.

The square root of 64855577 is about 8053.2960333021. The cubic root of 64855577 is about 401.7745677147.

The spelling of 64855577 in words is "sixty-four million, eight hundred fifty-five thousand, five hundred seventy-seven".